Babies Born with Low Birth Weights (Less Than 2500 Grams)

Babies born with low birth weights (less than 2500 grams) are at an increased risk for many infant diseases. Researchers in North Carolina collected data to see what variables may influence the birth weight (in grams) of a child, including whether the mother drank alcohol during pregnancy, whether the mother smoked during pregnancy, the mother's age (years) , the gestation of the pregnancy (number of weeks from conception until birth) , the mother's race, the length of the birth (hours) , and several others. The plot below summarizes some of the variables measured.
-Based on the plot, does there appear to be an association between gestation period and birth weight?

A) Yes, because as one variable increases, the other tends to increase as well.
B) No, because as one variable increases, the other tends to increase as well.
C) Yes, because most of the circles on the plot appear to be higher than the triangles.
D) No, because one variable does not appear to change the other variable.